Caretaker Labor Minister and chief of the government-run Centre for Maintaining Peace and Order, Chalerm Yoobamrung, said earlier that Yingluck would be able to work in the Government House again by Wednesday.

At around 10 a.m. local time, protesters started to build concrete walls to block gates of the Government House.

Chalerm said Sunday that police forces would be deployed from Monday in a bid to reclaim five protest sites in Bangkok from protesters, including the one near the Government House.

If there is resistance by armed protest guards, police might have to use guns to protect themselves, Chalerm said.